There's a new utility in the famous RTLSDR package: rtl_power. Coder keenerd says about it:
Rtl_power is a small CLI tool for logging wide swaths of bandwidth. You can specify any chunk of spectrum, with any FFT bin size and any logging rate. (For sane values of any.)
Read more at reddit:
I've done a hf scan with rtl_power lately. It shows a spectrum graphic from 3MHz to about 15MHz.
You can see it here:
Attention: it's a big picture! ;)
You can see many bc stations that come and go. OTHR are visible, too. And many other stations.
My setup was a DVB-Tstick modified as direct sampler. I connected my 12m wire to it.
It's a very cheat solution for non realtime / longterm hf band observations. But you can also use it with a unmodified DVB-T stick, too.
And now have some fun with rtl_power :)